An annotated census of the mosses of the Perth Region, Western Australia

2008·12.7 MB·

by  L J Biggs

Nuytsia 18: 1-30 (2008) - 1
An annotated census of the mosses of the Perth Region,
Western Australia
Louise J. Biggs'? and Jennifer A. Chappill'?
'School of Plant Biology, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009
2Western Australia Herbarium, Department of Environment and Conservation, Locked Bag 104,
Bentley Delivery Centre, Western Australia 6983
7Deceased August 8th 2006
Abstract
Biggs, L.J. & Chappill, J.-A. An annotated census of the mosses of the Perth Region, Western
Australia. Nuytsia 18: 1-30 (2008). A census oft he moss species of the Perth Region is based on field
studies and collections housed at the Western Australia Herbarium (PERTH). It includes 83 taxa in 45
genera and 21 families. The largest families recorded were Pottiaceae and Bryaceae. Two species not
previously recorded for Western Australia, Leptobryum pyriforme (Hedw.) Wilson and Pohlia nutans
(Hedw.) Lindb., are included.
Introduction
Bryophyte collections in the Perth Region began along the Swan River shortly after the British
settled in Fremantle in 1829 (Stoneburner et a/. 1993). The most significant contributors were James
Drummond (1784-1863) who collected extensively from the south-west region of Western Australia,
sending specimens to England, and the German botanist Ludwig Preiss (181141883) (Marchant eg al.
1987).
Since the 19th century there have been a number of census catalogues including, or focusing on,
Western Australian mosses (Hampe 1844; Mitten 1883; Watts & Whitelegge 1902; Bartram 1951;
Willis 1954; Scott & Stone 1976), with the most recent (Stoneburner ef a/. 1993) citing 192 taxa
including 30 new State records.
Western Australia is Australia9s largest State, occupying over one third of the area of the continent,
yet only 212 moss species have been recorded, a surprisingly low number. The Australian Capital
Territory, by comparison, is only 2,400 km? in area but has 208 species (Streimann & Klazenga 2002).
Western Australia is largely extremely dry and arid with low rainfall and humidity levels. These factors
play a role in the low species diversity of Western Australian mosses. Another possible contributor is
that surveys of such a large area are time consuming and therefore have not been accomplished to the
same extent as those of the smaller Eastern States. The collection of the new species Pleurophascum
occidentale R.E.Wyatt & A.H.Stoneb. in 1984 suggests that there are still more mosses to be discovered
in Western Australia.
2 Nuytsia Vol. 18 (2008)
The Perth Region lies primarily on the Swan Coastal Plain, with the Swan River flowing directly
through the area. Soils are of aeolian origin, consisting of shallow sandy soils over calcareous rock.
This supports a number of vegetation types including coastal dunes, heathlands, woodlands, and
shrublands of Acacia, Banksia, Melaleuca and eucalypts. Topography is low with the highest point
only 60 m above sea level. Climate is described as mediterranean with hot, dry summers and cold, wet
winters. Average annual rainfall for 1997-2007 was 731.88 mm with the highest rainfall recorded in
2005 with 874.8 mm and the lowest annual rainfall recorded in 2006 at 466.8 mm. Average monthly
temperatures in 2006 ranged from 5.8 °C in winter to 30.4°C in summer.
Methods
In this study the boundary used for the Perth Region follows that of Marchant ef al. (1987). The
area included is approximately 10,500 km? and extends from the coastline west of Boyanup in the
south, to Guilderton in the north, with the most easterly point at Wooroloo.
Over 700 collections from the Western Australian Herbarium (PERTH), together with additional
field collections from Bold Park in Floreat and Kings Park in West Perth have been included in the
survey, with each specimen being re-examined and identified for this paper. Nomenclature follows
Streimann and Klazenga (2002) and McCarthy (2006). Families are listed alphabetically, as are the taxa
within. Capsule descriptions have not been provided for all taxa herein as they are either uncommon
for the species or have not been present during collections.
Results and Discussion
The census includes 83 species in 21 families and 45 genera (Table 1). Pottiaceae, with 19
species, and Bryaceae, with 16 species, are the most strongly represented families. These families
also contained the most species in Stoneburner ef al.9s (1993) census of Western Australian mosses.
This is not surprising as they are well known habitants of arid ecosystems, often forming part of soil
crusts along with lichens, cyanobacteria, algae and fungi, stabilizing the soil, reducing erosion and
increasing soil nutrition (Eldridge & Tozer 1997). Fifteen species known from the Perth Region are
not currently represented by collections at the Western Australian Herbarium.
There are currently reported to be 304 endemic species of moss (Streimann & Klazenga 2002)
in Australia. Nine species and two infraspecific (ofa total of 304 fide Streimann & Klazenga 2002)
Australian endemic taxa are represented in the Perth Region: Bartramia hampeana Miill.Hal. subsp.
hampei (Mitt.) Catches., Campylopus australis Catches. & J.-P.Frahm, Campylopus flindersii Catches.
& J.-P.Frahm, Dicranoloma diaphanoneuron (Hampe & Miill.Hal.) Paris, Fabronia hampeana Sond.,
Gemmabryum austrosabulosum (Catches. ex J.R.Spence & H.P.Ramsay) J .R.Spence & H.P.Ramsay,
Gemmabryum inaequale (Taylor) J.R.Spence & H.P.Ramsay, Gemmabryum sullivanii (Miill.Hal.)
J.R.Spence & H.P.Ramsay, Leptodontium paradoxum 1.G.Stone & G.A.M.Scott, Philonotis australiensis
D.G.Griffin & W.R.Buck and Thuidium sparsum (Hook.f. & Wilson) A.Jaeger var. hastatum (Mitt.)
Touw & Falter-van den Haak.
Fabronia hampeana is endemic to Western Australia and the Perth Region. Two further Western
Australian endemic species, Calymperastrum latifolium (Hampe) I.G.Stone and Pleurophascum
occidentale have been found in the Denmark area of the south-west, outside the Perth Region. This
L.J. Biggs & J.A. Chappill, An annotated census of the mosses oft he Perth Region
Table 1. Moss families and genera of the Perth Region, Western Australia.
Familiy Genus Species
Archidiaceae Archidium 1
Bartramiaceae Bartramia 3
Breutelia 1
Philonotis 2
Bryaceae Bryum 2
Gemmabryum 8
Ptychostomum 1
Rosulabryum 5
Dicranaceae Campylopus 4
Dicranoloma 1
Ditrichaceae Ceratodon 1
Ditrichum 1
Eccremidium 4
Pleuridium 2
Fabroniaceae Fabronia 1
Fissidentaceae Fissidens 6
Funariaceae Entosthodon 3
Funaria
Gigaspermaceae Gigaspermum l
Grimmiaceae Grimmia 2
Hedwigiaceae Hedwigia |
Hedwigidium 1
Meesiaceae Leptobryum 1
Mniaceae Pohlia 1
Schizymenium 1
Orthodontiaceae Orthodontium I
Orthotrichiaceae Zygodon 1
Pottiaceae Barbula 3
Bryerythrophyllum 1
Didymodon 2
Gymnostomum 1
Leptodontium 1
Syntrichia 3
Tetrapterum it
Tortella |
Tortula 2
Trichostomum 1
Triquetrella 1
Weissia 2
Racopilaceae Racopilum 1
Rhabdoweisiaceae Amphidium 1
Sematophyllaceae Rhaphidorrhynchium 1
Sematophyllum 2
Splachnaceae Tayloria 1
Thuidiaceae Thuidium 1
4 Nuytsia Vol. 18 (2008)
number of endemic mosses is extremely low when 75% of vascular plants in the south-west are endemic
(Hopper 1979). Rhacocarpus rehmannianus (C.Muell.) Wijk & Margad. var. webbianus (Miill.Hal.)
J.P.Frahm was earlier thought to be a Western Australian endemic but has also been reported from
South Australia (Stoneburner et al. 1993; Streimann & Klazenga 2002).
Calymperastrum latifolium has a conservation status of Priority Two under the Department of
Environment and Conservation's (DEC) Conservation Codes for Western Australian Flora (Atkins
2008). This listing is given when taxa are known from one or a few (generally <5) populations, are
not currently critically endangered, and are under consideration for declaration as 8Rare Flora9 and
in need of further research. Pleurophascum occidentale has a status of Priority Four, meaning that
while adequate surveying has been undertaken it is considered rare, although not currently threatened
by any identifiable factors. These taxa are monitored every 5410 years (Atkins 2008). Rhacocarpus
rehmannianus var. webbianus is considered rare under the Western Australian Wildlife ConservatioAnc t
1950, meaning it has been adequately searched for and deemed to be rare and in danger of extinction
or in need special protection. To date none of these species have been located in the Perth region.
Census
Archidiaceae
Archidium rehmannii Mitt., J. Linn. Soc., Bot. 22: 300. 15 f. 5-8 (1886).
First collected in Western Australia by Wyatt and Stoneburner from swampy areas on bare sand
at Cannington Swamp. The plants are short, up to 15 mm tall, with numerous stiffly erect innovations
or branches arising from below the shoot apices. The leaves are narrowly lanceolate, to 1.5 mm long,
and the costa is broad. Capsules appear to be rare in Australian material. Elsewhere known only from
southern Africa.
Represented by one collection from the study area.
Bartramiaceae
Bartramia breutelii Schimp. ex Miill.Hal., Bot. Zeitung (Berlin) 16: 162 (1858).
Bell (2006) included five species of Bartramia Hedw. in the moss flora of Western Australia:
B. breutelii Mill.Hal., B. hampeana subsp. hampei (Mitt.) Catches., B. pseudostricta Catches.,
B. robusta Hook.f. & Wilson, and B. strictifolia Taylor. Bartramia afrostricta Mill.Hal. was included
in the Western Australian flora by Catcheside (1987) but synonymised by Magill (1987) in Anacolia
Schimp. as A. breutelii (Miill.Hal.) Magill. However, Bell (2006) has taken a more conservative
approach to the generic placement of this taxon, retaining it in Breutelia pending more detailed
investigation. The nomenclatural confusion surrounding B. strictifolia and related taxa is discussed
by Catcheside (1987).
L.J. Biggs & J.A. Chappill, An annotated census of the mosses of the Perth Region 5
Bartramia breutelii and B. strictifolia both have linear-lanceolate leaves with sheathing bases.
Bartramia pseudostricta also has linear-lanceolate leaves but these lack a sheathing base. Plants of
B. breutelii are 14 cm tall, yellow-green above, brownish green below, leaves erect, closely appressed
when dry, 3-4.5 mm long and 0.640.9 mm wide. Plants of B. strictifolia are generally less than 1.0 cm
tall, pale yellowish green above, brown below, with leaves closely appressed when dry, 2.7-3.5 mm
long and 0.640.75 mm wide.
The type collection of B. strictifolia is from 8Swan River9, collected by J. Drummond, who also made
an early collection of B. breutelii from 8Swan River9.
Represented by two collections from the study area.
Bartramia hampeana Miill.Hal. subsp. hampei (Mitt.) Catches., Lindbergia 29: 89 (2004).
Bartramia hampei (Mitt.) Catches., Mosses ofS outh Australia 281 (1980).
Catcheside (1980) transferred Bartramidula hampei Mitt., to Bartramia. He considered that while
this taxon was similar to Bartramia papillata Hook.f. & Wilson, the stems were generally shorter (less
than 1 cm long), the leaves less widely spreading and the lamina cells narrower. He also stated that
it was difficult to separate B. hampeana from B. papillata without capsules. Bell (2006) noted that
while B. hampeana \acked a peristome, in order to differentiate it from the peristomate B. robusta
Hook.f. & Wilson (syn. B. papillata), young capsules needed to be examined as the peristome was soon
lost. Matteri (1984) reduced B. papillata to a synonym of B. ithyphylla Brid. Bell (2006) considered this
species synonymous with B. robusta.
The leaves of B. hampeana and B. robusta have a sheathing base and linear-lanceolate upper lamina.
Plants of B. hampeana subsp. hampei, which is endemic to Australia, are less than 1 cm tall and dull
brown to yellowish green; leaves are suberect, with an oblong sheathing base and linear-lanceolate upper
limb, 245.5 mm long, 0.4-0.5 mm wide. Plants of B. robusta are up to 3 cm tall and yellowish green;
leaves have a sheathing base and linear-lanceolate upper limb, are 3.546.5 mm long, 0.541.0 mm wide,
and the limb is wide-spreading from the sheathing base.
Represented by two collections from the study area.
Bartramia pseudostricta Catches., Mem. New York Bot. Gard. 45: 621 (1987).
Plants form loose tufts that are glaucous-green above and brownish below. The stems are short with
the plants only up to | cm tall. The leaves are linear-lanceolate, erect-spreading and flexuose, and lack a
sheathing base. So far the species is only known from south-west Western Australia and the Flinders and
Mount Lofty Ranges in South Australia. It has been found growing in small patches on soil over rock.
Represented by three collections from the study area.
Breutelia affinis (Hook.) Mitt., Hookers J. Bot. Kew Gard. Misc. 8: 261 (1856).
Only one species of Breutelia has been reported from Western Australia. It is easily recognised by
its long (to 5 cm or more) stems that are usually branched near the apex, tomentose stems with brown
6 Nuytsia Vol. 18 (2008)
hairs and leaves that are erect-spreading, ovate-lanceolate to oblong-lanceolate and have longitudinally
pleated bases. Microscopically, the species is readily distinguished from other Australian species by
the leaves, which have numerous quadrate alar cells that extend to about 1/3 of the leaf length.
Represented by two collections from the study area.
Philonotis australiensis D.G.Griffin & W.R.Buck, Bryologist 92: 376 (1989).
Bartramidula pusilla (Hook.f. & Wilson) Paris, Index Bryol. 116 (1894).
Minute plants, reaching only to about 5 mm high. Leaves are pale to whitish green, ovate-lanceolate
to linear-lanceolate, and mostly less than 0.5 mm long. The globular to oblong, erect to pendulous
capsules are borne on an erect seta up to 10 mm tall. This species is endemic to Australia.
Represented by two collections from the study area.
Philonotis tenuis (Taylor) Reichardt, Reise Novara 1(1): 178 (1870).
A plant of damp to wet sheltered sites, forms dense tufts with the stems to 3 cm or more tall and
matted below with brown tomentum. The leaves are triangular-lanceolate to ovate-lanceolate, 0.541.5
mm long.
Represented by three collections from the study area.
Bryaceae
Bryaceae represents one oft he larger moss families, with 15 genera and around 600 species, and
is a family that has provided, and continues to provide, considerable taxonomic challenges (Spence &
Ramsay 2006). Ochi (1970, 1972, 1973, 1985) based his studies of Australian Bryaceae on herbarium
material only. More recently, Spence (1996, 2005), and Spence and Ramsay (1996, 1999, 2005, 2006)
have included extensive field studies. Nomenclature used here follows Spence and Ramsay (2006).
Bryum argenteum Hedw., Sp. Musc. Frond. 181 (1801).
A common and cosmopolitan species, B. argenteum is frequently found in urban areas on soil, on
pavements, on walls, rocks etc. Plants form patches, with the shoots densely packed and silvery green.
Asexual bulbils are commonly found in the leaf axils of sterile shoots. Spence and Ramsay (2006)
consider it possible that the species has been introduced to Australia.
Represented by 11 collections from the study area.
Bryum lanatum (P.Beauv.) Brid., Muscol. Recent. Suppl. 3: 20 (1817).
Anomobryum lanatum (P.Beauv.) J.R.Spence & H.P.Ramsay, Telopea 9: 785 (2002).
L.J. Biggs & J.A. Chappill, An annotated census of the mosses oft he Perth Region 7
Like B. argenteum, this species is whitish green and forms dense tufts. It is often treated as a variety
of B. argenteum. The leaf costa of B. /anatum is excurrent into a long hyaline hairpoint. Although
Spence and Ramsay (2006) consider the hair-pointed leaves to merit specific status, intermediate forms
are frequently encountered, and the retention of these as distinct species remains equivocal.
Represented by four collections from the study area.
Gemmabryum australe (Hampe) J.R.Spence & H.P.Ramsay, Phytologia 87: 65 (2005).
Bryum australe Hampe, Icon. Musc. 26 (1844).
Forms low golden or brownish green tufts. A rare species of silty soils in open habitats, it is
characterised by the stiffly erect, closely imbricate and bristle-like leaves, the costa excurrent as a
long hairpoint, the leaf margins strongly recurved and the small, swollen, purple capsules (Spence
& Ramsay 2006).
The type specimen was collected by L. Preiss from 8Swan River9, Western Australia.
Represented by one collection from the study area.
Gemmabryum cheelii (Broth.) J.R.Spence & H.P.Ramsay, Phytologia 87: 65 (2005).
Bryum cheelii Broth., Proc. Linn. Soc. New South Wales 4: 591 (1916).
Endemic to Australia, plants are up to 2.5 cm tall and form medium-sized, glossy red to reddish
tinged tufts on rock. The leaves are 243.5 mm long, stiff, densely imbricate and ovate to oblong-
lanceolate. The leaf margin is recurved, serrulate near the apex and lacks a differentiated border. Spence
& Ramsay (2006) state that the species appears to be close to the Northern Hemisphere Jmbribryum
muehlenbeckii (Bruch & Schimp.) N.Pedersen.
Represented by one collection from the study area.
Gemmabryum chrysoneuron (Miill.Hal.) J.R.Spence & H.P.Ramsay, Phytologia 87: 66 (2005).
Bryum chrysoneuron Mill.Hal., Bot. Zeitung (Berlin) 9: 549 (1851).
Forms loose to dense, glossy yellowish green to yellowish brown tufts that are often tinged with
red. The glossy, golden green leaves with long hairpoints are distinctive. The species also produces
abundant, red-coloured, rounded tubers.
The type specimen was collected by J. Drummond from 8Swan River9, Western Australia.
Represented by two collections from the study area.
8 Nuytsia Vol. 18 (2008)
Gemmabryum dichotomum (Hedw.) J.R.Spence & H.P.Ramsay, Phytologia 87: 66 (2005).
Bryum dichotomum Hedw., Sp. Musc. Frond. 183. pl. 42: f. 8-12 (1801).
A common species of wetter soils. Plants form brown to yellowish green tufts, often bearing
numerous bulbils in the leaf axils. The production of numerous bulbils makes this an effective early
colonist.
The type specimen was collected by J. Drummond from 8Swan River9, Western Australia.
Represented by three collections from the study area.
Gemmabryum inaequale (Taylor) J.R.Spence & H.P.Ramsay, Phytologia 87: 67 (2005).
Bryum inaequale Taylor, London J. Bot. 5: 53 (1846).
Plants are small, up to 10 mm tall, the leaves green to yellowish green and glossy. The leaves are
imbricate, erect-spreading when moist, appressed when dry, and form comal tufts. Spence and Ramsay
(2006) state that the species is often found on vertical earth banks. The collections have come from a
variety of habitats, including crevices in rock, on soil, along drainage ditches and the edges of small
streams, mostly from moister sites. The species is endemic to Australia.
The type specimen was collected in 1843 by J. Drummond from 8Swan River9, Western Australia.
Represented by five collections from the study area.
Gemmabryum pachythecum (Miill.Hal.) J.R.Spence & H.P.Ramsay, Phytologia 87: 64 (2005).
Bryum pachytheca Miill.Hal., Syn. Muse. Frond. 1: 307 (1848).
The plants form mats or tufts and are golden to reddish green. The pendant capsules are about 2 mm
long, purple to crimson-brown and have the apophysis wider than the urn when moist, but narrower
when dry. The apophysis is also distinctly roughened to corrugate. A common species of sandy loam
soils and disturbed habitats in urban areas.
The type specimen was collected by L. Preiss in 1839 from York, Western Australia.
Represented by 16 collections from the study area.
Gemmabryum preissianum (Hampe) J.R.Spence & H.P.Ramsay, Phytologia 87: 67 (2005).
Brachymenium preissianum (Hampe) A.Jaeger, Ber. Thdtigkeit. St. Gallischen Naturwiss. Ges.
1873-74: 113 (Gen. Sp. Muse. 1: 575) (1875).
Plants are short and form dense green to yellowish green tufts. Spence and Ramsay (2006) give the
small, lanceolate to ovate-lanceolate leaves that are up to 1 mm in length with a short stout hairpoint,
L.J. Biggs & J.A. Chappill, An annotated census of the mosses oft he Perth Region 9
and the narrow-mouthed, inclined to horizontal capsules with a rostellate operculum as characteristic
of the species.
The type specimen was collected in 1823 by L. Preiss in Fremantle, Western Australia.
Represented by 6 collections from the study area.
Gemmabryum sullivanii (Miill.Hal.) J.R.Spence & H.P.Ramsay, Phytologia 87: 68 (2005).
Bryum sullivanii Miill.Hal., Oefvers. Forh. Finska Vetensk.-Soc. 35: 48 (1893).
Stated by Spence and Ramsay (2006) to be a rare species found mainly on damp soil or rock in
or near streams and often on limestone. The stems are short, only to about 3 mm tall. The plants are
green to brownish green or blackish and glossy when moist, the leaves ovate, concave, weakly costate,
and evenly distributed along the stems. This species is endemic to Australia.
Represented by three collections from the study area.
Ptychostomum angustifolium (Brid.) J.R.Spence & H.P.Ramsay, Phytologia 87: 23 (2005).
Bryum caespiticium Hedw., Sp. Musc. Frond. 180 (1801), fide J.R.Spence, Phytologia
87: 23 (2005).
The plants form dense, comose tufts up to 2 cm tall, pale bright green above and: brownish below.
Spence and Ramsay (2006) give the elongate, thin-walled laminal cells, absence of a distinct leaf
border and long excurrent hairpoint as diagnostic features. It is dioicous, having separate male and
female plants. The majority of collections have come from disturbed sites, such as charcoal and burnt
soil, between paving stones and along garden paths.
Represented by ten collections from the study area.
Rosulabryum albolimbatum (Hampe) J.R.Spence, Bryologist 99: 223 (1996).
Bryum albolimbatum (Hampe) A.Jaeger, Ber. Thatigk. St. Gallischen Naturwiss. Ges. 1873-74: 191
(Gen. Sp. Musc. 1: 653) (1875).
The genus Rosulabryum J.R.Spence is characterised by the plants having the leaves enlarged and
crowded at the stem apex, resembling a rosette. The leaves are generally oblong-ovate with serrate
margins and the plants often have rhizoidal tubers.
The plants form loose, deep green to reddish green tufts. The leaves are up to 3.5 mm long with
the upper margins coarsely serrate. Filamentous gemmae are often found in the leaf axils and the
rhizoidal tubers are orange, rounded to ovoid and 250-400 tm in diameter.
Ochi (1970) considered this species a synonym of Bryum (Rosulabryum) capillare Hedw., but
later (Syed 1973) R. albolimbatum was recognised as a distinct species. It is a widespread Australian
endemic species, occurring on soil or, more commonly, in moist and shaded habitats on wood or rock
(Spence & Ramsay 2006).
10 Nuytsia Vol. 18 (2008)
The type specimen was collected by F. Mueller from the Porongorups in 1867.
| Represented by eight collections from the study area.
Rosulabryum billarderi (Schwagr.) J.R.Spence, Bryologist 99: 223 (1996), as 8billardieret9.
Bryum billarderi Schwagr., Sp. Musc. Frond., Suppl. 2: 115. pl. 76. (1816).
A widespread species growing on soil, soil over rock, or on wood. The plants form loose to dense,
green to yellowish green tufts. The leaves are up to 5 mm long, with the margin distinctly toothed in
the upper part, recurved towards the base and with a narrow border 1-3 cells wide. Rhizoidal tubers
are red to orange, rounded to ovoid and up to 1 mm in diameter. It is a variable species and has been
comprehensively revised by Haji Mohamed (1979).
Represented by 20 collections from the study area.
Rosulabryum campylothecium (Taylor) J.R.Spence, Bryologist 99: 223 (1996).
Bryum campylothecium Taylor, London J. Bot. 5: 52 (1846).
Forms yellowish green to brownish green, loose to dense tufts. The leaves have small, blunt teeth
along the upper margins and the margins are recurved at the base. The marginal border is 244 cells
wide. The costa is excurrent as a long hairpoint. Neither rhizoidal tubers nor axillary gemmae are
known for the species. Spence and Ramsay (2006) state that the golden or yellow-green colour of the
plants, the leaves that are ovate, concave and imbricate, and the absence of tubers are characteristic.
The type specimen was collected by J. Drummond in 1843 from 8Swan River9, Western Australia.
Represented by 11 collections from the study area.
Rosulabryum capillare (Hedw.) J.R.Spence, Bryologist 99: 223 (1996).
Bryum capillare Hedw., Sp. Musc. Frond. 182 (1801).
The plants form loose to dense, dark green tufts. When dry the leaves are spirally twisted around the
stems. The leaves are up to 3 mm long, the upper margins finely serrulate, and the costa is percurrent
to shortly excurrent. Reddish brown, globular to ovoid rhizoidal tubers 60-250 1m in diameter are
produced.
Represented by one collection from the study area.
Rosulabryum torquescens (Bruch ex De Not.) J.R.Spence, Bryologist 99: 223 (1996).
Bryum torquescens Bruch ex De Not., Syllab. Musc. 163 (1838).
A common species of drier habitats. Plants form loose to dense, green to reddish green tufts. The
leaves are contorted but not spirally twisted around the stems when dry. The leaf margins are toothed,